[#3213] HashtagsTableMigrator: fault rate allowance to enable the feature (defaults to 1%), counting of affected objects, misc. tweaks.

lib/pleroma/migrators/hashtags_table_migrator.ex

@@ -15,7 +15,8 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
   alias Pleroma.Object
   alias Pleroma.Repo
 
-  defdelegate data_migration(), to: State
+  defdelegate data_migration(), to: Pleroma.DataMigration, as: :populate_hashtags_table
+  defdelegate data_migration_id(), to: State
 
   defdelegate state(), to: State
   defdelegate persist_state(), to: State, as: :persist_to_db
@@ -23,10 +24,13 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
   defdelegate put_stat(key, value), to: State, as: :put_data_key
   defdelegate increment_stat(key, increment), to: State, as: :increment_data_key
 
+  @feature_config_path [:database, :improved_hashtag_timeline]
   @reg_name {:global, __MODULE__}
 
   def whereis, do: GenServer.whereis(@reg_name)
 
+  def feature_state, do: Config.get(@feature_config_path)
+
   def start_link(_) do
     case whereis() do
       nil ->
@@ -46,8 +50,6 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
   def handle_continue(:init_state, _state) do
     {:ok, _} = State.start_link(nil)
 
-    update_status(:pending)
-
     data_migration = data_migration()
     manual_migrations = Config.get([:instance, :manual_data_migrations], [])
 
@@ -56,10 +58,14 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
         update_status(:noop)
 
       is_nil(data_migration) ->
-        update_status(:failed, "Data migration does not exist.")
+        message = "Data migration does not exist."
+        update_status(:failed, message)
+        Logger.error("#{__MODULE__}: #{message}")
 
       data_migration.state == :manual or data_migration.name in manual_migrations ->
-        update_status(:manual, "Data migration is in manual execution state.")
+        message = "Data migration is in manual execution or manual fix mode."
+        update_status(:manual, message)
+        Logger.warn("#{__MODULE__}: #{message}")
 
       data_migration.state == :complete ->
         on_complete(data_migration)
@@ -78,7 +84,7 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
     update_status(:running)
     put_stat(:started_at, NaiveDateTime.utc_now())
 
-    %{id: data_migration_id} = data_migration()
+    data_migration_id = data_migration_id()
     max_processed_id = get_stat(:max_processed_id, 0)
 
     Logger.info("Transferring embedded hashtags to `hashtags` (from oid: #{max_processed_id})...")
@@ -89,12 +95,19 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
     |> Stream.each(fn objects ->
       object_ids = Enum.map(objects, & &1.id)
 
+      results = Enum.map(objects, &transfer_object_hashtags(&1))
+
       failed_ids =
-        objects
-        |> Enum.map(&transfer_object_hashtags(&1))
+        results
         |> Enum.filter(&(elem(&1, 0) == :error))
         |> Enum.map(&elem(&1, 1))
 
+      # Count of objects with hashtags (`{:noop, id}` is returned for objects having other AS2 tags)
+      chunk_affected_count =
+        results
+        |> Enum.filter(&(elem(&1, 0) == :ok))
+        |> length()
+
       for failed_id <- failed_ids do
         _ =
           Repo.query(
@@ -116,6 +129,7 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
       put_stat(:max_processed_id, max_object_id)
       increment_stat(:processed_count, length(object_ids))
       increment_stat(:failed_count, length(failed_ids))
+      increment_stat(:affected_count, chunk_affected_count)
       put_stat(:records_per_second, records_per_second())
       persist_state()
 
@@ -125,17 +139,42 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
     end)
     |> Stream.run()
 
-    with 0 <- failures_count(data_migration_id) do
-      _ = delete_non_create_activities_hashtags()
-      set_complete()
-    else
-      _ ->
-        update_status(:failed, "Please check data_migration_failed_ids records.")
+    fault_rate = fault_rate()
+    put_stat(:fault_rate, fault_rate)
+    fault_rate_allowance = Config.get([:populate_hashtags_table, :fault_rate_allowance], 0)
+
+    cond do
+      fault_rate == 0 ->
+        set_complete()
+
+      is_float(fault_rate) and fault_rate <= fault_rate_allowance ->
+        message = """
+        Done with fault rate of #{fault_rate} which doesn't exceed #{fault_rate_allowance}.
+        Putting data migration to manual fix mode. Check `retry_failed/0`.
+        """
+
+        Logger.warn("#{__MODULE__}: #{message}")
+        update_status(:manual, message)
+        on_complete(data_migration())
+
+      true ->
+        message = "Too many failures. Check data_migration_failed_ids records / `retry_failed/0`."
+        Logger.error("#{__MODULE__}: #{message}")
+        update_status(:failed, message)
     end
 
+    persist_state()
     {:noreply, state}
   end
 
+  def fault_rate do
+    with failures_count when is_integer(failures_count) <- failures_count() do
+      failures_count / Enum.max([get_stat(:affected_count, 0), 1])
+    else
+      _ -> :error
+    end
+  end
+
   defp records_per_second do
     get_stat(:processed_count, 0) / Enum.max([running_time(), 1])
   end
@@ -194,6 +233,7 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
     |> where([_o, hashtags_objects], is_nil(hashtags_objects.object_id))
   end
 
+  @spec transfer_object_hashtags(Map.t()) :: {:noop | :ok | :error, integer()}
   defp transfer_object_hashtags(object) do
     embedded_tags = if Map.has_key?(object, :tag), do: object.tag, else: object.data["tag"]
     hashtags = Object.object_data_hashtags(%{"tag" => embedded_tags})
@@ -201,7 +241,7 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
     if Enum.any?(hashtags) do
       transfer_object_hashtags(object, hashtags)
     else
-      {:ok, object.id}
+      {:noop, object.id}
     end
   end
 
@@ -209,13 +249,11 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
     Repo.transaction(fn ->
       with {:ok, hashtag_records} <- Hashtag.get_or_create_by_names(hashtags) do
         maps = Enum.map(hashtag_records, &%{hashtag_id: &1.id, object_id: object.id})
-        expected_rows = length(hashtag_records)
-
-        base_error =
-          "ERROR when inserting #{expected_rows} hashtags_objects for obj. #{object.id}"
+        base_error = "ERROR when inserting hashtags_objects for object with id #{object.id}"
 
         try do
-          with {^expected_rows, _} <- Repo.insert_all("hashtags_objects", maps) do
+          with {rows_count, _} when is_integer(rows_count) <-
+                 Repo.insert_all("hashtags_objects", maps, on_conflict: :nothing) do
             object.id
           else
             e ->
@@ -260,11 +298,11 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
       data_migration.feature_lock ->
         :noop
 
-      not is_nil(Config.get([:database, :improved_hashtag_timeline])) ->
+      not is_nil(feature_state()) ->
         :noop
 
       true ->
-        Config.put([:database, :improved_hashtag_timeline], true)
+        Config.put(@feature_config_path, true)
         :ok
     end
   end
@@ -274,38 +312,41 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator do
     |> join(:inner, [o], dmf in fragment("SELECT * FROM data_migration_failed_ids"),
       on: dmf.record_id == o.id
     )
-    |> where([_o, dmf], dmf.data_migration_id == ^data_migration().id)
+    |> where([_o, dmf], dmf.data_migration_id == ^data_migration_id())
     |> order_by([o], asc: o.id)
   end
 
-  def failures_count(data_migration_id \\ nil) do
-    data_migration_id = data_migration_id || data_migration().id
-
+  def failures_count do
     with {:ok, %{rows: [[count]]}} <-
            Repo.query(
              "SELECT COUNT(record_id) FROM data_migration_failed_ids WHERE data_migration_id = $1;",
-             [data_migration_id]
+             [data_migration_id()]
            ) do
       count
     end
   end
 
   def retry_failed do
-    data_migration = data_migration()
+    data_migration_id = data_migration_id()
 
     failed_objects_query()
     |> Repo.chunk_stream(100, :one)
     |> Stream.each(fn object ->
-      with {:ok, _} <- transfer_object_hashtags(object) do
+      with {res, _} when res != :error <- transfer_object_hashtags(object) do
         _ =
           Repo.query(
             "DELETE FROM data_migration_failed_ids " <>
               "WHERE data_migration_id = $1 AND record_id = $2",
-            [data_migration.id, object.id]
+            [data_migration_id, object.id]
           )
       end
     end)
     |> Stream.run()
+
+    put_stat(:failed_count, failures_count())
+    persist_state()
+
+    force_continue()
   end
 
   def force_continue do

lib/pleroma/migrators/hashtags_table_migrator/state.ex

@@ -7,7 +7,7 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator.State do
 
   alias Pleroma.DataMigration
 
-  defdelegate data_migration(), to: DataMigration, as: :populate_hashtags_table
+  defdelegate data_migration(), to: Pleroma.Migrators.HashtagsTableMigrator
 
   @reg_name {:global, __MODULE__}
 
@@ -99,4 +99,6 @@ defmodule Pleroma.Migrators.HashtagsTableMigrator.State do
   defp persist_non_data_change(_, _) do
     nil
   end
+
+  def data_migration_id, do: Map.get(state(), :data_migration_id)
 end